#! /bin/bash
# FS QA Test No. 153
#
# Ensure that collapse-range on all copies of a file reflinked N times releases the blocks
#   - Record fs block usage (0)
#   - Create a file and some reflink copies
#   - Record fs block usage (1)
#   - Collapse-range some blocks of the copies
#   - Record fs block usage (2)
#   - Truncate all blocks of the copies
#   - Compare fs block usage to (2), (1), and (0)
#
#-----------------------------------------------------------------------
# Copyright (c) 2015, Oracle and/or its affiliates.  All Rights Reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-----------------------------------------------------------------------

seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1    # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
    cd /
    rm -rf $tmp.* $testdir
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/reflink

# real QA test starts here
_supported_os Linux
_require_test_reflink
_require_cp_reflink
_require_xfs_io_command "fcollapse"

rm -f $seqres.full

testdir=$TEST_DIR/test-$seq
rm -rf $testdir
mkdir $testdir

echo "Create the original file blocks"
blksz="$(stat -f $testdir -c '%S')"
blks=2000
margin='15%'
sz=$((blksz * blks))
free_blocks0=$(stat -f $testdir -c '%f')
nr=4
filesize=$((blksz * nr))
_pwrite_byte 0x61 0 $sz $testdir/file1 >> $seqres.full
_test_remount

echo "Create the reflink copies"
for i in `seq 2 $nr`; do
	_cp_reflink $testdir/file1 $testdir/file$i
done
_test_remount
free_blocks1=$(stat -f $testdir -c '%f')

echo "Collapse most of the blocks"
$XFS_IO_PROG -f -c "fcollapse 0 $(((blks - 1) * blksz))" $testdir/file2
$XFS_IO_PROG -f -c "fcollapse 0 $((sz / 2))" $testdir/file3
$XFS_IO_PROG -f -c "fcollapse $((sz / 2)) $(( ((blks / 2) - 1) * blksz))" $testdir/file4
_test_remount
free_blocks2=$(stat -f $testdir -c '%f')

echo "Collpase nearly all the files"
$XFS_IO_PROG -f -c "fcollapse 0 $(( ((blks / 2) - 1) * blksz))" $testdir/file3
$XFS_IO_PROG -f -c "fcollapse 0 $((sz / 2))" $testdir/file4
$XFS_IO_PROG -f -c "fcollapse 0 $(( (blks - 1) * blksz))" $testdir/file1
_test_remount
free_blocks3=$(stat -f $testdir -c '%f')
#echo $free_blocks0 $free_blocks1 $free_blocks2 $free_blocks3

_within_tolerance "free blocks after reflink" $free_blocks1 $((free_blocks0 - blks)) $margin -v

_within_tolerance "free blocks after fcollapsing some reflink copies" $free_blocks2 $free_blocks1 $margin -v

_within_tolerance "free blocks after fcollapsing all copies" $free_blocks3 $free_blocks0 $margin -v

# success, all done
status=0
exit